JP2555677Y2 - Ballpoint pen - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a raw ink type ballpoint pen in which ink is directly filled in an ink cylinder.

[0002]

2. Description of the Related Art Since inks, particularly water-based inks, have low viscosities, it is necessary to prevent dropping of ink in ballpoint pens using water-based inks. For this reason, there are many batting types in which aqueous ink is contained in the batting formed into a rod by aligning the crimped ultrafine fibers, and the ink in the batting is supplied to the ball via a relay core. However, such a ballpoint pen has a drawback that the writable distance is short because the ink absorbing capacity of the batting is limited, and it is impossible to use up the ink completely to the end, and the endpoint is difficult to understand.

For this reason, a raw ink type ball-point pen has been put into practical use in which an ink cylinder is directly filled with ink, and a pen core having a mechanism for replacing air and ink and a mechanism for containing excess ink is disposed at the tip of a shaft cylinder. I have. The raw ink type ball-point pen has the advantages that a large amount of ink can be filled in the ink cylinder, so that the writable distance is long and the ink can be used up to the end.

[0004]

However, the above-mentioned pen core has a complicated structure because it has a capillary ink groove and an air groove, and an ink storage section composed of a large number of comb teeth. Therefore, precision is required because it is necessary to closely adhere to the inner peripheral surface of the substrate. Therefore, it takes time to manufacture the pen core,
This was an obstacle to cost reduction.

Accordingly, an object of the present invention is to provide a raw ink type ballpoint pen which has a simple structure and can be manufactured at low cost.

[0006]

In order to achieve this object, a ballpoint pen according to the present invention is arranged such that a slide stopper is slidably disposed in a liquid-tight manner in an ink cylinder and ink is filled in front of the slide stopper. At the same time, the tip, which holds the ball freely rotatably with the ball partly protruding from the tip, is fixed to the tip of the ink cylinder. Make contact. Alternatively, a paste-like anti-reflux agent is disposed in place of the slide stopper.

[0007]

When not in use, the ball held rotatably at the tip of the chip is repelled by a spring and is in contact with the inward tip edge of the chip. Thus, a valve mechanism is formed, and even if the ink has a low viscosity, dropping of the ink is prevented. On the other hand, when writing,
The ball retreats with the pen pressure, the valve mechanism opens and ink is consumed, but the negative pressure in the ink cylinder due to ink consumption is eliminated because the slide stopper or the backflow preventive advances with the consumption of ink. Ink is supplied to the ball and becomes writable. That is, since a pen core having a complicated structure and requiring high precision is not required, the structure can be simplified and manufactured at a low cost.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the embodiments shown in the drawings. In FIG. 1, a bullet-shaped stainless steel tip 2 has an inner hole 21 which is an ink passage hole.
And a ball house 22 is formed at the tip. The ball house 22 communicates with the inner hole 21 through a center hole 23 and a radial groove 24 formed radially. And
In the ball house 22, a ball 1 made of a cemented carbide having a diameter of 1.0 mm, for example, is movably held in the front-rear direction by a predetermined distance, and a part of the ball 1 protrudes from a tip edge 26 of the chip 2. .

A small-mass spring 5 is arranged in an inner hole 21 of the chip 2. And this spring 5
Is inserted into the center hole 23 to urge the ball 1 forward, and the ball 1 is in contact with the tip edge 26 of the chip 2 when not in use. That is, ball 1 and chip 2
A valve mechanism is constituted by the leading edge 26 of the ink cartridge, and prevents ink dropping without using a pen core. Note that a pressing element may be interposed between the ball 1 and the spring 5, and the ball 1 may be urged forward by the pressing element. The tip 2 is connected directly or via a holder (not shown) to the front end opening of the ink cylinder 3 serving as a shaft cylinder.

A slide stopper 4 made of, for example, silicone rubber is slidably disposed in the ink cylinder 3 in a liquid-tight manner.
, A low-viscosity aqueous ink (not shown) is completely filled, and no air is mixed. Therefore, when the ink is consumed, the slide stopper 4 slides forward. In other words, although it is a raw ink type ballpoint pen with a long writable distance, air that easily expands due to heat is not mixed in front of the slide stopper 4, so that the sliding resistance of the slide stopper 4 contributes to prevention of ink dripping. doing. A tail plug 6 having a vent 61 is fitted to the tail end of the ink cylinder 3. Alternatively, as shown in FIG. 2, a paste-like anti-reflux agent 7 is disposed in place of the slide stopper 4, and the low-viscosity aqueous ink (not shown) is filled from the anti-reflux agent 7 to the inner hole 21 of the chip 2. May be.

In use, when the ball 1 is moved along the writing surface while being pressed, the ball 1 retreats against the resilience of the spring 5 and rotates in contact with the seat 25. So you can write. At this time, when the ink is consumed, the pressure in the ink cylinder 1 becomes negative, but as the ink is consumed, the slide stopper 4 or the backflow preventing agent 7 moves forward. Therefore, the negative pressure in the ink cylinder 1 is eliminated, and the ink is sufficiently supplied to the ball 1 so that writing can be continued.

[0012]

As described above, when the ballpoint pen of the present invention is not used, the ball held freely at the tip of the tip is repelled by a spring and comes into contact with the inward tip edge of the tip when not in use. In addition, a slide stopper or a paste-like anti-reflux agent is arranged inside the ink cylinder to constitute the valve mechanism, preventing ink dripping and also allowing the slide stopper to advance even if ink is consumed, so that the ink is moved forward. The writing in the cylinder can be continued without negative pressure. Accordingly, a pen core having a complicated structure and requiring precision is not required, and a ballpoint pen having a simple structure and capable of being manufactured at low cost can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view of another embodiment of the present invention.

[Explanation of symbols]

 1 Ball 2 Chip 21 Inner Hole 22 Ball House 23 Center Hole 26 Tip Edge 3 Ink Tube 4 Slide Plug 5 Spring 6 Tail Plug 7 Backflow Prevention Agent

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 49-30035 (JP, U) Japanese Utility Model Sho 58-95273 (JP, U) Japanese Utility Model Sho 61-1773397 (JP, U) Japanese Utility Model Hei 5- 51480 (JP, U) Japanese Utility Model Hei 5-58362 (JP, U) JP-B 64-10554 (JP, B2) JP-B 6-6399 (JP, B2)

Claims (2)

(57) [Scope of request for utility model registration] 1. A slide stopper is slidably arranged in a liquid-tight state in an ink cylinder, ink is filled in front of the slide stopper, and a ball is free to rotate with a part of the ball protruding from the tip. A tip held by the ink cylinder, the ball being repelled by a spring and in contact with the inward tip edge of the tip when not in use. 2. A paste-like anti-reflux agent is placed in an ink cylinder, ink is filled in front of the anti-reflux agent plug, and the ball is free to rotate with a part of the ball protruding from the tip. A ball-point pen characterized in that a held chip is fixed to the tip of an ink cylinder, and the ball is repelled by a spring and is in contact with the inward tip edge of the tip when not in use.